225 x 143 Signature/Spa-Quip Wide Mouth Nature 2 CartridgeStandard wide mouth Nature 2 replacement filter cartridge. Has a open top and the bottom has a coarse thread spigot. The open top is designed so you can purchase a cap that will hold a Nature 2 stick in the centre of the filter. Filter dimensions: Height 225mm (not including spigot), Width 143mm, Spigot ID 35mm. Commonly used on Signature Spas, Spa Quip and Others. Box QTY: 9 *Please note due to manufacturing tolerances there may be a slight variation